Perhaps you should try some spelling variations:
tang tai » dung tai, dong tai, tang van
hang tai » dung tai
cao duc » dao duc, cao suc, giao duc
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
sac kho » suc khoe, cac khoi, dac khoa
ve cao » va cao, ve bao, ve cac
tu sac » tu sach, tu cac, tu san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac kho ((tang tai) OR (sang tao)) khoi. hieu ve cao duc va ((hang tai) or (hang va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac kho ((tang tai) OR (sang tao)) khoi. hieu ve cao duc va ((hang tai) OR (hang va)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac kho ((tang tai) OR (sang tao)) khoi. hieu ve cao duc va ((hang tai) or (hang va)) cuu tre*".